Figure 66. Marconi echometer - a Langevin-Chilowsky echometer system presented at the Fourth Hydrographic Conference in Monaco under the name “Special Model for Hydrographic Studies and Shallow Water Soundings, Langevin-Chilowsky system. ” This sounding system first became available in 1937.
Photo Category: Oceanography - Historical instruments
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|Added On||18th October 2015|